Some flowers to brighten up the office serve double duty as pens. I've always wanted to try this. Now another batch for the desk next to me and one for home should do it. Cosmos grow carefree from seed, these annuals (meaning they grow just one year) fill a flowerbed with color and are great cut flowers. They grow from 1 foot to 3 feet high, depending on the variety and prefer soil that has little nutrients.